Facepunch Studios founder Garry Newman says he's already made more revenue in two months of selling Rust on Steam's Early Access service than he has in eight years of selling Garry's Mod on Steam proper.

Newman announced that the sandbox physics game Garry's Mod, released in 2006, surpassed $30 million in sales last Friday. He then quickly followed up with the news that Facepunch has already made more money from Rust than it has from Garry's Mod.

Newman later clarified that Facepunch has a more favorable royalty rate on Rust as compared to Garry's Mod, to the tune of 70 percent vs. 50 percent, respectively.

Given that Rust also costs twice as much as Garry's Mod -- $20 and $10, respectively -- and that Steam's userbase has grown remarkably in the past eight years, it's not so surprising that Newman has earned more money in a far shorter timeframe with his second game, which surpassed the 1 million copies sold mark earlier this month.